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consensus: fix panic during verifyBlock

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Issue: panic during mixed 4-nodes consensus setup:
```
2021-03-18T12:01:50.715Z	INFO	skip change view	{"nc": 0, "nf": 3}
2021-03-18T12:01:52.786Z	INFO	received ChangeView	{"validator": 0, "reason": "Timeout", "new view": 1}
2021-03-18T12:01:53.602Z	INFO	received ChangeView	{"validator": 2, "reason": "Timeout", "new view": 1}
2021-03-18T12:01:56.736Z	INFO	received ChangeView	{"validator": 1, "reason": "Timeout", "new view": 1}
2021-03-18T12:01:56.736Z	INFO	changing dbft view	{"height": 3, "view": 1, "index": 3, "role": "Backup"}
2021-03-18T12:02:01.758Z	INFO	received PrepareRequest	{"validator": 2, "tx": 0}
panic: interface conversion: block.Block is nil, not *consensus.neoBlock

goroutine 315 [running]:
github.com/nspcc-dev/neo-go/pkg/consensus.(*service).verifyBlock(0xc000419540, 0x0, 0x0, 0x4)
	github.com/nspcc-dev/neo-go/pkg/consensus/consensus.go:427 +0x1306
github.com/nspcc-dev/dbft.(*DBFT).createAndCheckBlock(0xc0001f8840, 0x13f0002)
	github.com/nspcc-dev/dbft@v0.0.0-20210302103605-cc75991b7cfb/dbft.go:373 +0x27e
github.com/nspcc-dev/dbft.(*DBFT).onPrepareRequest(0xc0001f8840, 0x13f4378, 0xc0003b8500)
	github.com/nspcc-dev/dbft@v0.0.0-20210302103605-cc75991b7cfb/dbft.go:329 +0xdf1
github.com/nspcc-dev/dbft.(*DBFT).OnReceive(0xc0001f8840, 0x13f4378, 0xc0003b8500)
	github.com/nspcc-dev/dbft@v0.0.0-20210302103605-cc75991b7cfb/dbft.go:247 +0xe25
github.com/nspcc-dev/neo-go/pkg/consensus.(*service).eventLoop(0xc000419540)
	github.com/nspcc-dev/neo-go/pkg/consensus/consensus.go:297 +0x79d
created by github.com/nspcc-dev/neo-go/pkg/consensus.(*service).Start
	github.com/nspcc-dev/neo-go/pkg/consensus/consensus.go:249 +0xa5
```

So (*service).verifyBlock is unable to work with nil block.
This commit is contained in:
Anna Shaleva 2021-03-18 18:05:24 +03:00
parent e5cdecfa9f
commit 4809cdf0b0
1 changed files with 4 additions and 6 deletions
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10
pkg/consensus/consensus.go
View file

@ -648,9 +648,6 @@ func convertKeys(validators []crypto.PublicKey) (pubs []*keys.PublicKey) {
func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
block := new(neoBlock)
if ctx.TransactionHashes == nil {
return nil
}
block.Block.Network = s.ProtocolConfiguration.Magic
block.Block.Timestamp = ctx.Timestamp / nsInMs
@ -658,7 +655,7 @@ func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
if s.ProtocolConfiguration.StateRootInHeader {
sr, err := s.Chain.GetStateModule().GetStateRoot(ctx.BlockIndex - 1)
if err != nil {
return nil
s.log.Fatal(fmt.Sprintf("failed to get state root: %s", err.Error()))
}
block.StateRootEnabled = true
block.PrevStateRoot = sr.Root
@ -672,11 +669,11 @@ func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
validators, err = s.Chain.GetNextBlockValidators()
}
if err != nil {
return nil
s.log.Fatal(fmt.Sprintf("failed to get validators: %s", err.Error()))
}
script, err := smartcontract.CreateMultiSigRedeemScript(s.dbft.Context.M(), validators)
if err != nil {
return nil
s.log.Fatal(fmt.Sprintf("failed to create multisignature script: %s", err.Error()))
}
block.Block.NextConsensus = crypto.Hash160(script)
block.Block.PrevHash = ctx.PrevHash
@ -685,6 +682,7 @@ func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
primaryIndex := byte(ctx.PrimaryIndex)
block.Block.PrimaryIndex = primaryIndex
// it's OK to have ctx.TransactionsHashes == nil here
hashes := make([]util.Uint256, len(ctx.TransactionHashes))
copy(hashes, ctx.TransactionHashes)
block.Block.MerkleRoot = hash.CalcMerkleRoot(hashes)